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2 The COVID-19 vaccine development, manufacturing, transportation, and administration proved 3 an extreme logistics operation of global magnitude. Global vaccination levels, however, remain a 4 key concern in preventing the emergence of new strains and minimizing the impact of the 5 pandemic’s disruption of daily life. In this paper, country-level vaccination rates are analyzed 6 through a queuing framework to extract service rates that represent the practical capacity of a 7 country to administer vaccines. These rates are further characterized through regression and 8 interpretable machine learning methods with country-level demographic, governmental, and 9 socio-economic variates. Model results show that participation in multi-governmental 10 collaborations such as COVAX may improve the ability to vaccinate. Similarly, improved 11 transportation and accessibility variates such as roads per area for low-income countries and rail 12 lines per area for high-income countries can improve rates. It was also found that for low-income 13 countries specifically, improvements in basic and health infrastructure (as measured through 14 spending on healthcare, number of doctors and hospital beds per 100k, population percent with 15 access to electricity, life expectancy, and vehicles per 1000 people) resulted in higher vaccination 16 rates. Of the high-income countries, those with larger 65+ populations struggled to vaccinate at 17 high rates, indicating potential accessibility issues for the elderly. This study finds that improving 18 basic and health infrastructure, focusing on accessibility in the last mile, particularly for the 19 elderly, and fostering …